Why is my phone saying my IMEI is null?

i get samsung galaxy s3 GT-I9301I
ANDROid 4.4.2 kitkat english
after i have changed this version english another version 4.4.2 kit kat I9301IXXUANF5_I9301IOJVUANF1_I9301IXXUANF2_HOME.tar.md5
the same with the first (original) but
probleme now i can't do call (no service sim in the phone)
and i *#06#* IMIE NULL
plz help me